MOST SIGNIFICANT RESEARCH CONTRIBUTIONS

 Since 1995, Dr. Henni has published twenty refereed journal articles and more than twelve conference papers. In 1995 he published some of his work done at the University of Alberta with Dr. Alan E. Mather, and related to the solubility of carbon dioxide, nitrous oxide and methane in physical (methanol, triethylene glycol monomethyl ether) and mixed solvents (aqueous MDEA + methanol or TEGMME) at high pressures.

  (a) Solubility Measurement and Modeling

 1.      Henni A., J. Shaffiq and Mather A.E., “Equilibrium Solubility of CO₂ and N₂O in Dodecane", Can.  J. Chem. Eng., 74, 554-557, (1996).

2.      Henni  A. , D. Lal and Mather A.E., “Equilibrium Solubility of Ethane in Triethylene Glycol Monomethyl Ether”, Can. J. Chem. Eng., 74(3), 423-425 (1996).

3.      Henni A., D. Lal, and Mather A.E., “Equilibrium Solubility of Ethane in NMP”, Can. J. Chem. Eng., 74, 423-425, (1996).

4.      Henni A. and Mather A. E., “ Solubility of CO₂, N₂O, CH₄, C₂H₆ in Polar Solvents”, J. Can. Pet. Tech., Nov. 1999 (special issue).

5.      Henni A. and A.E. Mather “ Solubility of Methane in Polar Solvents”, Submitted to The Industrial & Engineering Chemistry Research Journal.

6.      Henni A., P. Tontiwachwuthikul, A. Chakma, “Solubility of CO₂ in Fourteen Polar Solvents at temperatures from 25 °C to 60 °C”, Manuscript to be Submitted to J. Chem. Eng. Data.

7.      Henni A., P. Tontiwachwuthikul, A. Chakma, “Solubility of Methane and Ethane in Five Promising Solvents For Natural Gas Sweetening at temperatures from 25 °C to 60 °C”, Manuscript to be Submitted to J. Chem. Eng. Data.

8.      Henni   A., J. Carroll and Mather A.E., “Vapor-Liquid-Liquid Locus of the system CO₂- Water", Manuscript in preparation.

Most of the high-pressure solubility work was done when the applicant was at the University of Alberta. Since joining the University of Regina, he has started building a solubility program to screen a large number of physical solvents for their capacity for CO₂.  A simple solubility model based on a modification of the Solubility parameter theory was developed to predict the solubility of CO₂, methane and ethane in any physical solvent and at any temperature if the solubility in one solvent is known at a given temperature.  

  (b)   Physical and Transport Properties Measurement and Modeling

1.      Henni A., P. Tontiwachwuthikul, A. Chakma and Mather A. E., “Densities and  Viscosities for Binary Mixtures of Triethylene Glycol Monomethyl Ether and Water in the Interval 25 °C to 80 °C”, J. Chem. Eng.  Data, 44, 101-107 (1999).\

2.      Henni A., Y. Maham, P. Tontiwachwuthikul, A. Chakma and Mather A. E., “Densities and Viscosities for Binary Mixtures of Triethylene Glycol Monomethyl Ether and N-Methyldiethanolamine from 25 °C to 70 °C and N-Methyldiethanolamine + Ethanol at 40 °C”, J. Chem. Eng. Data, 45, 247-253, 2000.

3.      Henni A., P. Tontiwachwuthikul, A. Chakma and Mather A. E., “Volumetric Properties and Viscosities for Aqueous Diglycolamine Solutions from    25 °C to 70 °C”, J. Chem. Eng. Data, 47, 124-130, 2000.

4.      Henni A., Hromek, J. J., P. Tontiwachwuthikul, A. Chakma, “Volumetric Properties and Viscosities of Aqueous AMP from 25 °C to 70 °C”, In Press, J. Chem. Eng. Data.

5.      Henni A., P. Tontiwachwuthikul, A. Chakma, “Volumetric Properties and Viscosities of Aqueous Tetraethylene Glycol Dimethyl Ether from 25 °C to 70 °C”, Manuscript to be Submitted to J. Chem. Data.

6.      Henni A., P. Tontiwachwuthikul, A. Chakma, “Volumetric Properties and Viscosities of Aqueous N-Formyl Morpholine from 25 °C to 70 °C”, Manuscript to be Submitted to J. Chem. Data.

 Measurements of the density, viscosity of aqueous solutions of physical and alkanolamines were performed in order to provide the applicant and other researchers with the vital data. The final aim is to have a better picture of the interactions between water and the solvent. With enough information about the most promising solvents (chemical or physical) is it possible to come up with an “ideal” solvent? As the conclusion of these studies, the author recently concluded that there is a strong possibility of formation of a stable complex in aqueous alkanolamine and physical solvent systems. The author intends to do more investigation in this matter using the analytical equipment requested in this proposal.  He has also proceeded to measure the density, Viscosity and refractive index and used a model to be able to predict the viscosity of any glycol ether at any temperature if the density of the solvent is known.

      (c) Kinetics studies

1)      Henni A., P. Tontiwachwuthikul and A. Chakma, “ Kinetics of CO₂ Absorption with Chemical Reactions in Mixed Solvents: A Comprehensive Review”, 47th Canadian Chemical Engineering Conference, Edmonton, October 7-10, 1997.

    The kinetics studies were initiated after building an acrylic cell reactor. It is the intent of the author to investigate the effect of different polar solvents on the absorption of CO₂ in tertiary amines. Dr. Henni has proven that there is an obvious and substantial enhancement of the absorption rate of CO₂ in MDEA in the presence of polar solvents. This is in contradiction with what is published in the literature. Dr. Henni also plans to measure CO₂ absorption in alkanolamines with more than one amine group. Research work has shown that the addition of a physical solvent enhanced the absortion rate of a mixed solvent over its aqueous alkanolamine counterpart.The kinetics work is still in progress.

         (d) Calorimetry

Dr. Henni is active in measuring the heat of mixing and the specific heats of several promising alkanolamines and physical solvents with water using a C80 SETARAM calorimeter. He plans to add a flow cell in order to measure the heat of absorption of CO₂, SO₂ and other gases in solvents.